San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
What Is The Largest Size A Rat Can Get To Be?
With an average lifespan of about 2 - 3 years, some species of rats can grow as large as 4 pounds. But on average, almost all rats are bigger than mice. Also, the size of a rat fairly depends on the specie and the sex of the rat. Male rats usually are larger than females. They have a longer body frame with tails as long as their body and can grow as big as 2 lbs.
Domesticated rats usually do better when it comes to size mainly because they are provided with all they need to grow properly and healthily. For pet rats, an adult rat can grow to a length of 9 to 11 inches with a tail length of 7 to 9 inches. If properly managed, some large species of rats can even grow as long as 20 inches. It all depends on how well the rats are being managed and taken care of.
One of the most fascinating thing about rats is that having a large body size doesn't mean they won't be able to pass through small openings and enter into your home. Rats can compress their body in order to be able to pass through small openings. Provided the opening is wide enough to allow the easy passage of its head, it will pass through. Therefore, you shouldn't consider the fact that the rats in your neighborhood are too big to gain access to your home through small openings. Instead, you need to seal all small openings up as soon as possible to avoid a rat infestation.
When it comes to rats with large sizes, the Bosavi woolly rat is one of a kind. This specie of rat can weigh up to 3.5 lbs. and grow as long as 32 inches. Although, this particular specie of rat can only be found in volcanic caves.
